can i bring these on the flight with me in my carry on ??

Anybody know where you can buy Soy Butter in the UK?

http://www.kitchen-garden.co.uk/shop/index.php?productID=127

You might want to check any local health food stores. If they don't have it they might be able to get it in for you. Also, Holland and Barrett have some alternative nut butters, but they may not be what you are looking for.

Be careful what you consider food though.  Security made me throw away two brand new sealed jars of Soy Butter (think Peanut Butter).  My boys are allergic to nuts so I had brought some for the move and it ended up in my carry on because my checked bag was 1.5 pounds over.  Not only was I now out about $12, my boys have been going through massive withdraw without it!

Anybody know where you can buy Soy Butter in the UK?

It's called "soya" in the UK - that will probably help your search! I'd try the same "health food" shops you'd find it in in the US.

Thanks for the "soya", I am sure that will help.

No alternative nut butters, they are allergic to those as well. 

Be careful what you consider food though.  Security made me throw away two brand new sealed jars of Soy Butter (think Peanut Butter).  My boys are allergic to nuts so I had brought some for the move and it ended up in my carry on because my checked bag was 1.5 pounds over.  Not only was I now out about $12, my boys have been going through massive withdraw without it!

Anybody know where you can buy Soy Butter in the UK?

ouch, sorry about that.

My suggestion is to try alternative spreads. I quite like hemp 'butter' or hummus.

I'd tend to avoid soy products because of the GM factor.